Geochemistry and Origin of Acidic Rocks from Jaspa and Rohtang, Himachal Pradesh

Geochemical investigations on the Jaspa granites and Rohtang gneisses from Himachal Pradesh indicate that the Rohtang gneisses are the migmatlsed/granltised products of the pre-existing metasediments and the Jaspa granite is an intrusive granite. Field relationship suggests that the Jaspa granite is a post-tectonic intrusive while the migmatisation/granltisation of the gneisses appear to be pre-and syntectonic and might have continued into the post-tectonic period.